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KILLALL(1) User Commands KILLALL(1)
NAME
killall - kill processes by name
SYNOPSIS
killall [-Z, --context pattern] [-e, --exact] [-g, --process-group] [-i, --interactive]
[-n, --ns PID] [-o, --older-than TIME] [-q, --quiet] [-r, --regexp] [-s, --signal SIG-
NAL, -SIGNAL] [-u, --user user] [-v, --verbose] [-w, --wait] [-y, --younger-than TIME]
[-I, --ignore-case] [-V, --version] [--] name ...
killall -l
killall -V, --version
DESCRIPTION
killall sends a signal to all processes running any of the specified commands. If no sig-
nal name is specified, SIGTERM is sent.
Signals can be specified either by name (e.g. -HUP or -SIGHUP) or by number (e.g. -1) or
by option -s.
If the command name is not regular expression (option -r) and contains a slash (/), pro-
cesses executing that particular file will be selected for killing, independent of their
name.
killall returns a zero return code if at least one process has been killed for each listed
command, or no commands were listed and at least one process matched the -u and -Z search
criteria. killall returns non-zero otherwise.
A killall process never kills itself (but may kill other killall processes).
OPTIONS
-e, --exact
Require an exact match for very long names. If a command name is longer than 15
characters, the full name may be unavailable (i.e. it is swapped out). In this
case, killall will kill everything that matches within the first 15 characters.
With -e, such entries are skipped. killall prints a message for each skipped entry
if -v is specified in addition to -e.
-I, --ignore-case
Do case insensitive process name match.
-g, --process-group
Kill the process group to which the process belongs. The kill signal is only sent
once per group, even if multiple processes belonging to the same process group were
found.
-i, --interactive
Interactively ask for confirmation before killing.
-l, --list
List all known signal names.
-n, --ns
Match against the PID namespace of the given PID. The default is to match against
all namespaces.
-o, --older-than
Match only processes that are older (started before) the time specified. The time
is specified as a float then a unit. The units are s,m,h,d,w,M,y for seconds, min-
utes, hours, days, weeks, months and years respectively.
-q, --quiet
Do not complain if no processes were killed.
-r, --regexp
Interpret process name pattern as a POSIX extended regular expression, per
regex(3).
-s, --signal, -SIGNAL
Send this signal instead of SIGTERM.
-u, --user
Kill only processes the specified user owns. Command names are optional.
-v, --verbose
Report if the signal was successfully sent.
-V, --version
Display version information.
-w, --wait
Wait for all killed processes to die. killall checks once per second if any of the
killed processes still exist and only returns if none are left. Note that killall
may wait forever if the signal was ignored, had no effect, or if the process stays
in zombie state.
-y, --younger-than
Match only processes that are younger (started after) the time specified. The time
is specified as a float then a unit. The units are s,m,h,d,w,M,y for seconds, min-
utes, hours, days, weeks, Months and years respectively.
-Z, --context
Specify security context: kill only processes having security context that match
with given extended regular expression pattern. Must precede other arguments on
the command line. Command names are optional.
FILES
/proc location of the proc file system
KNOWN BUGS
Killing by file only works for executables that are kept open during execution, i.e. im-
pure executables can't be killed this way.
Be warned that typing killall name may not have the desired effect on non-Linux systems,
especially when done by a privileged user.
killall -w doesn't detect if a process disappears and is replaced by a new process with
the same PID between scans.
If processes change their name, killall may not be able to match them correctly.
killall has a limit of names that can be specified on the command line. This figure is
the size of an unsigned long integer multiplied by 8. For most 32 bit systems the limit
is 32 and similarly for a 64 bit system the limit is usually 64.
SEE ALSO
kill(1), fuser(1), pgrep(1), pidof(1), pkill(1), ps(1), kill(2), regex(3).
psmisc 2021-01-11 KILLALL(1)
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